20. A student observed a layer of rock that contained several fossils. Which of these processes were most directly involved in forming this layer of rock?
a. freezing and thawing
b. evaporation and condensation
C. erosion and runoff
d. sedimentation and compaction

The model of human settlement suggests that uthe model of human settlement suggests that urban growth is patterned around transportation networks such as railroads and highways. a. burgess b. hoyt c. sauer d. von thunenrban growth is patterned around transportation networks

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.

Name the two rivers that run through the fertile crescent. how were the rivers both positive and negative to societies of the fertile crescent?